netdev - Re: [PATCH] qed: Enable RDMA relaxed ordering

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Date:   Thu, 26 Aug 2021 12:05:18 +0000
From:   Shai Malin <smalin@...vell.com>
To:     Leon Romanovsky <leon@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Ariel Elior <aelior@...vell.com>,
        "malin1024@...il.com" <malin1024@...il.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        "jgg@...pe.ca" <jgg@...pe.ca>
Subject: Re: [PATCH] qed: Enable RDMA relaxed ordering

On Mon, Aug 23, 2021 at 02:52:21PM +0300, Leon Romanovsky wrote:
> +RDMA
> 
> Jakub, David
> 
> Can we please ask that everything directly or indirectly related to RDMA
> will be sent to linux-rdma@ too?

In addition to all that was discussed regarding qed_rdma.c 
and qed_rdma_ops - certainly, everything directly or indirectly 
related to RDMA will be sent to linux-rdma.

> 
> On Sun, Aug 22, 2021 at 09:54:48PM +0300, Shai Malin wrote:
> > Enable the RoCE and iWARP FW relaxed ordering.
> >
> > Signed-off-by: Ariel Elior <aelior@...vell.com>
> > Signed-off-by: Shai Malin <smalin@...vell.com>
> > ---
> >  drivers/net/ethernet/qlogic/qed/qed_rdma.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/qlogic/qed/qed_rdma.c
> b/drivers/net/ethernet/qlogic/qed/qed_rdma.c
> > index 4f4b79250a2b..496092655f26 100644
> > --- a/drivers/net/ethernet/qlogic/qed/qed_rdma.c
> > +++ b/drivers/net/ethernet/qlogic/qed/qed_rdma.c
> > @@ -643,6 +643,8 @@ static int qed_rdma_start_fw(struct qed_hwfn
> *p_hwfn,
> >  				    cnq_id);
> >  	}
> >
> > +	p_params_header->relaxed_ordering = 1;
> 
> Maybe it is only description that needs to be updated, but I would
> expect to see call to pcie_relaxed_ordering_enabled() before setting
> relaxed_ordering to always true.

This change will only allow the FW to support relaxed ordering but it 
will be enabled only if the device/root-complex/server supports 
relaxed ordering.
The pcie_relaxed_ordering_enabled() is not needed in this case.

> 
> If we are talking about RDMA, the IB_ACCESS_RELAXED_ORDERING flag should
> be taken into account too.

Thanks! 
We will need to add both FW and driver support to enable it.

> 
> Thanks
> 
> > +
> >  	return qed_spq_post(p_hwfn, p_ent, NULL);
> >  }
> >
> > --
> > 2.22.0
> >